WebUI: Stop compiling Closure compiler, just download it instead.

Historically the Closure compiler was compiled from scratch, because it was
modified to include a Chrome-specific pass. ChromePass.java has been upstreamed
to the canonical repo for a while now, so there is no need to keep building the
compiler from scratch anymore (as of r445661)

Benefits: Rolling a new Closure compiler version is now much
 - Faster (before it took a few minutes, now it takes a few seconds).
 - Easier (no more dependencies to mvn and jdk, no setup required)

Cons:
 - No automated changelog link between previous and new versions.
 - Can't pull in closure-compiler master branch anymore, instead only what's at
   https://dl.google.com/closure-compiler/compiler-latest.zip is available.

This CL also rolls a new Closure compiler version as a proof that the new
roll_closure_compiler script works.

Bug: 867683
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I19671593a32c379ce9c3fb919f889aab56d939cf
Reviewed-on: https://chromium-review.googlesource.com/1214746Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590377}

third_party/closure_compiler/README.chromium

 Name: Closure compiler
 Short Name: closure-compiler
 URL: http://github.com/google/closure-compiler
-Version: v20180725-137c24759
-Date: 2018/07/27 19:34
-Revision: 137c2475944651f45433965afa9f1cddf7d1966b
+Version: v20180805
+Date: 2018/09/08 01:00
 License: Apache 2.0
 License File: LICENSE
 Security Critical: no

third_party/closure_compiler/externs/chrome_extensions.js

@@ -6248,6 +6248,16 @@ chrome.system.display.GetInfoFlags;
 chrome.system.display.MirrorModeInfo;
 
 
+/**
+ * @typedef {!{
+ *   manufacturerId: string,
+ *   productId: string,
+ *   yearOfManufacture: number,
+ * }}
+ */
+chrome.system.display.Edid;
+
+
 /**
  * An undocumented type that defines the objects passed to getInfo()'s callback.
  * @constructor
@@ -6263,6 +6273,10 @@ chrome.system.display.DisplayUnitInfo.prototype.id;
 chrome.system.display.DisplayUnitInfo.prototype.name;
 
 
+/** @type {!chrome.system.display.Edid|undefined} */
+chrome.system.display.DisplayUnitInfo.prototype.edid;
+
+
 /** @type {string} */
 chrome.system.display.DisplayUnitInfo.prototype.mirroringSourceId;
 

third_party/closure_compiler/externs/polymer-1.0.js

@@ -1368,6 +1368,23 @@ DomRepeatElement.prototype.indexForElement = function(el) {};
 DomRepeatElement.prototype.renderedItemCount;
 
 
+/**
+ * Event object for an event handler on a child of a dom-repeat template.
+ * @see https://www.polymer-project.org/1.0/docs/devguide/templates#handling-events
+ * @extends {CustomEvent}
+ * @constructor
+ * @template T
+ */
+var DomRepeatEvent = function() {};
+
+/**
+ * @type {{
+ *   index: number,
+ *   item: T
+ * }}
+ */
+DomRepeatEvent.prototype.model;
+
 
 /**
  * @see https://github.com/Polymer/polymer/blob/master/src/lib/template/array-selector.html

third_party/closure_compiler/roll_closure_compiler

@@ -3,16 +3,12 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
-# Download the newest version of Closure Compiler, build it and put into Chrome
-# source tree. Also update externs/chrome_extensions.js.
-#
-# TODO(dbeam): we don't really need to build the compiler any more. We used to
-# need to because we built a custom runner. We could probably just curl
-# https://dl.google.com/closure-compiler/compiler-latest.zip and unzip. And get
-# the externs from rawgit.com.
+# Download the newest version of Closure Compiler (pre-compiled), and put into
+# Chrome source tree. Also download latest versions of various externs files.
 
 readonly SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 readonly TEMP_DIR=$(mktemp -d)
+readonly EXTERNS_DIR_URL="https://raw.githubusercontent.com/google/closure-compiler/master/contrib/externs"
 readonly EXTERNS_DIR="${SCRIPT_DIR}/externs"
 readonly README="${SCRIPT_DIR}/README.chromium"
 
@@ -26,65 +22,25 @@ get_sha1() {
 
 trap cleanup SIGINT SIGHUP SIGTERM
 
-old_head=$(egrep -o "^Revision: [0-9a-f]{5,40}$" "${README}" | cut -d" " -f2)
 old_chrome_sha1=$(get_sha1 "${EXTERNS_DIR}/chrome.js")
 old_extensions_sha1=$(get_sha1 "${EXTERNS_DIR}/chrome_extensions.js")
 old_polymer_sha1=$(get_sha1 "${EXTERNS_DIR}/polymer-1.0.js")
 
 cd "${TEMP_DIR}"
 
-echo "Cloning Closure Compiler repo"
-git clone --depth 1 https://github.com/google/closure-compiler.git
-
-cd closure-compiler
+echo "Downloading Closure Compiler latest..."
+wget https://dl.google.com/closure-compiler/compiler-latest.zip
+unzip compiler-latest.zip
 
-new_head="$(git rev-parse HEAD)"
-new_version="$(git log HEAD -n1 --date=format:%Y%m%d --pretty=format:v%cd-%h)"
+jar_file=$(basename $(find . -name '*.jar'))
+new_version=$(basename $(echo ${jar_file} | cut -f3 -d-) .jar)
 new_date="$(date --utc '+%Y/%m/%d %H:%M')"
 
-if [[ "${new_head}" == "${old_head}" ]]; then
-  echo "No closure-compiler changes since last roll. Nothing to do."
-  cleanup
-  exit 0
-else
-  head_range=$(cat <<EOT
-Change log:
-https://github.com/google/closure-compiler/compare/${old_head}...${new_head}
-EOT
-)
-fi
-
-check_jdk_version() {
-  # Pretty contrived checks modeling how we write Maven XML files.
-  if [ ! -r "$2" ]; then
-    echo "Could not find $2" >&2
-    exit 1
-  elif ! fgrep -q '<jdk.version>'$1'</jdk.version>' "$2"; then
-    echo "JDK version $1 must be specified in $2" >&2
-    exit 1
-  elif ! fgrep -q '<source>${jdk.version}</source>' "$2"; then
-    echo "Java source must be specified to be \${jdk.version} in $2" >&2
-    exit 1
-  elif ! fgrep -q '<target>${jdk.version}</target>' "$2"; then
-    echo "Java target must be specified to be \${jdk.version} in $2" >&2
-    exit 1
-  fi
-}
+cp "${jar_file}" "${SCRIPT_DIR}/compiler/compiler.jar"
 
-echo "Checking JDK Version Used to Build"
-check_jdk_version 1.8 pom.xml
-
-echo "Building Closure Compiler"
-mvn clean install -DskipTests=true --projects com.google.javascript:closure-compiler,com.google.javascript:closure-compiler-externs
-
-if [[ "$?" -ne 0 ]]; then
-  echo "Failed to build jar, copying nothing" >&2
-  cleanup
-  exit 1
-fi
-
-# TODO(dbeam): the Maven-built jar seems a little bigger than the ant version.
-cp target/closure-compiler-1.0-SNAPSHOT.jar "${SCRIPT_DIR}/compiler/compiler.jar"
+wget ${EXTERNS_DIR_URL}/chrome.js
+wget ${EXTERNS_DIR_URL}/chrome_extensions.js
+wget ${EXTERNS_DIR_URL}/polymer-1.0.js
 
 readonly WARNING="$(cat <<EOT
 //    SSSSSSSSSSSSSSS TTTTTTTTTTTTTTTTTTTTTTT     OOOOOOOOO     PPPPPPPPPPPPPPPPP
@@ -106,9 +62,9 @@ readonly WARNING="$(cat <<EOT
 EOT
 )"
 
-(echo "${WARNING}" && cat contrib/externs/chrome.js) > "${EXTERNS_DIR}/chrome.js"
-(echo "${WARNING}" && cat contrib/externs/chrome_extensions.js) > "${EXTERNS_DIR}/chrome_extensions.js"
-(echo "${WARNING}" && cat contrib/externs/polymer-1.0.js) > "${EXTERNS_DIR}/polymer-1.0.js"
+(echo "${WARNING}" && cat chrome.js) > "${EXTERNS_DIR}/chrome.js"
+(echo "${WARNING}" && cat chrome_extensions.js) > "${EXTERNS_DIR}/chrome_extensions.js"
+(echo "${WARNING}" && cat polymer-1.0.js) > "${EXTERNS_DIR}/polymer-1.0.js"
 
 new_chrome_sha1=$(get_sha1 "${EXTERNS_DIR}/chrome.js")
 if [[ "${new_chrome_sha1}" != "${old_chrome_sha1}" ]]; then
@@ -130,9 +86,9 @@ echo "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
 echo "@"
 echo "@  ROLL RESULTS:"
 echo "@"
-echo "@  closure-compiler.git HEAD:"
-echo "@    Old: ${old_head}"
-echo "@    New: ${new_head}"
+echo "@  closure-compiler-latest.zip version:"
+echo "@    Old: ${old_version}"
+echo "@    New: ${new_version}"
 echo "@"
 echo "@  externs/chrome.js SHA1:"
 echo "@    Old: ${old_chrome_sha1}"
@@ -149,11 +105,11 @@ echo "@"
 echo "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
 echo
 
-sed -i "s/^Revision: ${old_head}$/Revision: ${new_head}/; s,^Date: .*,Date: ${new_date},; s,^Version: .*,Version: ${new_version}," "${README}"
+sed -i "s,^Date: .*,Date: ${new_date},; s,^Version: .*,Version: ${new_version}," "${README}"
 
 echo "git commit -a -m 'Roll closure compiler"
 echo
-echo "${head_range}"
+
 if [[ ! -z "${chrome_range}" ]]; then echo "${chrome_range}"; fi
 if [[ ! -z "${extensions_range}" ]]; then echo "${extensions_range}"; fi
 if [[ ! -z "${polymer_range}" ]]; then echo "${polymer_range}"; fi